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It is very difficult to comprehend the sheer volume that large numbers represent. For example, a person bringing home a $40,000 annual salary would earn $1 million in 25 years, $1 billion in 25 thousand years and $1 trillion in 25 million years. With a United States population of 305 million people, each person would have to contribute $3,280 to make a combined total of $1 trillion.

One billion is equal to 1,000 million. One billion is written with a one followed by nine zeros, while one million is written with a one followed by six zeros. One billion is also written as 10^9, and one million is written as
10^6.